“Can anyone figure out what on earth this giant egg-like thing is, near Acton, Massachusetts?
Update: As ever our readers have come to the rescue, and it seems that this is the Annursnac Hill Reservoir, a covered water storage facility sitting on the top of Annursnac Hill. There’s a fantastic birds-eye view of …”

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]]>Can anyone figure out what on earth this giant egg-like thing is, near Acton, Massachusetts?
Update: As ever our readers have come to the rescue, and it seems that this is the Annursnac Hill Reservoir, a covered water storage facility sitting on the top of Annursnac Hill. Theres a fantastic birds-eye view of -71.39499742.4777940100000-71.394997,42.477794